You could call Taylor Swift baby Oprah, and the stage is her version of Winfrey’s couch.

Easily the most important pop star of today, Swift boasts star power that has reached even greater heights and stretched outside of music, thanks to her uber successful, star-studded 1989 World Tour.

In typical Swift fashion, she has invited fellow radiofriendly singers to join her onstage, including Nick Jonas, Jason Derulo, John Legend and close gal pals Selena Gomez and Lorde. But Swift, 25, has also shared her stage with iconic folksinger Joan Baez and breakthrough acts like The Weeknd and Fetty Wap, who sang his hit Trap Queen, a contemporary love song about cooking cocaine – among other things – with your lover.

And then there were the tour’s unorthodox moments: Ellen DeGeneres appeared onstage, Lisa Kudrow sang the memorable Smelly Cat from Friends at one show, and Kudrow’s former co-star, Matt LeBlanc, hit the stage at a show with Chris Rock. Julia Roberts even walked the stage like a runway as Swift performed her hit Style.

The pop star also invited athletes to join in on the fun, from Kobe Bryant to Serena friends, from Gigi Hadid and Williams to the U.S. women’s Karlie Kloss. soccer team, just days after

“Interviewers always ask they won the World Cup. me how we ‘get’ these people And the models she calls her to come to the shows to walk, and the truth is that everyone who has walked the catwalk at one of the shows was already there just to see the show. Usually I ask them in my pre-show meet and greet if they want to come out onstage, then I’ll explain to them how the stage/elevator lift works and we just wing it,” Swift said in an email to The Associated Press.

Many of her surprise guests have children who are diehard Swifties.

“Joan Baez and Julia Roberts were both at my show in Santa Clara, and they were in my meet-and-greet room together. Julia is such a huge Joan fan and they were really hitting it off. I asked them if they wanted to walk out onstage together and Julia’s kids exploded into ‘PLEASE!!’ So that’s how that happened.”

Other guests on the 1989 World Tour, which kicked off in Tokyo in May, have included Justin Timberlake, Alanis Morissette, Natalie

Maines of the Dixie Chicks, Sam Hunt, Wiz Khalifa and Beck.

“A lot of stars you can see maybe not wanting to kind of share the spotlight and not wanting to necessarily have other people up there with her, but Taylor’s thrilled to do that,” said Josh Duboff, who interviewed Swift for the cover of Vogue’s September issue.

“She’s kind of excited to share the stage, which I think is kind of unique right now.”

Mary J. Blige, who sang her songs Family Affair and Doubt at the Staples Center in Los Angeles with Swift, said the singer “was someone I always loved way before she invited me to her show.”

“It’s amazing. She deserves it. She’s a giver. She’s a real sweetheart, big heart – so she’s getting back everything that she is,” the RB diva said of Swift and her big-time tour guests. “People support her.”

At the same show, Swift performed a duet with Emmy winner and Orange is the New Black star Uzo Aduba, marking her second appearance on the singer’s tour. Girl group Fifth Harmony said Swift learned the choreography for their latest hit, Worth It, in 20 minutes backstage before they performed in front of 60,000 screaming fans in Santa Clara, Calif.

“I was actually crying while we were performing. I really was and like, I couldn’t even sing my words correctly, especially when she came and stood right next to us,” band member Dinah Jane Hansen said. “I mean, come on. It’s Taylor Swift.”

Swift has been a longtime supporter of her musical peers, and the Swift approval could help launch or boost a career.

Ed Sheeran’s star power rose after Swift declared she loved his music on social media, introducing him to her feverish fan base. (She’s the most followed person on Instagram with 46.5 million followers and she boasts 63.5 million followers on Twitter.)

“Like, if they succeed, she succeeds. We all succeed together,” said Nicholas Petricca, the Walk the Moon lead singer who performed his band’s massive hit Shut up and Dance with Swift on her tour.

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